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Abstract

The High Performance Transparent Bridge (HPTB) is an architecture for implementing multiport bridges interconnecting gigabit speed networks. The provision of specialized hardware support, coupled with the proper partitioning of bridging protocol entities, enable the processing of frames at very high rates. The architecture allows the concurrent bridging of asynchronous, synchronous and isochronous traffic among heterogeneous networks. Both traditional frame-based networks, such as LANs, and cell-based networks, using ATM technology, are supported and can be interconnected transparently through the HPTB.

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United States

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English (United States)

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This is the abbreviated version, containing approximately
18% of the total text.

Architecture for High Performance Transparent Bridges

The High Performance Transparent Bridge (HPTB) is
an
architecture for implementing multiport bridges interconnecting
gigabit speed networks. The provision of
specialized hardware
support, coupled with the proper partitioning of bridging protocol
entities, enable the processing of frames at very high rates. The
architecture allows the concurrent bridging of asynchronous,
synchronous and isochronous traffic among heterogeneous networks.
Both traditional frame-based networks, such as LANs, and cell-based
networks, using ATM technology, are supported and can be
interconnected transparently through the HPTB.

The current
standard procedure for LAN bridging is referred to
as transparent bridging (1). According
to this procedure, the bridge
should examine the header of every frame flowing through every
network attached to it. Based on the destination address of the
frame, the bridge should be able to decide whether that frame is
destined to a node residing on the same side through which it is
received (in which case, it will be ignored) or the destination is
reachable through another port (in which case, it is received
(copied) by the bridge and forwarded to the proper output port to
continue its journey to its final destination).
In this procedure
also, a bridge has to learn the ports through which a certain node
can be reached. This is done by
monitoring the source addresses of
the frames received through each port.

Moreover,
emerging standards and application requirements are
introducing new types of traffic that need to be relayed by future
bridges. The isochronous service is the
most crucial among these
because of its very little tolerance to delay and, especially,
jitter. The HPTB described in this
article is an attempt to address
these issues. A more detailed
description of the components of the
HPTB is contained in (2). The example
described there is based on
the design of a bridge capable of interconnecting up to seven high
bandwidth networks. Each network is
expected to run at rates
reaching 800 Mbps (622 Mbps for ATM cell-based networks). Slower
speed networks, such as FDDI, can be grouped and attached to a single
port of the HPTB through special network attachment units, thus
forming a tree structure within the bridge.
Isochronous traffic from
several ports can be handled with less than 3 microsecond delay, if
its aggregate rate does not exceed 622 Mbps.
Basic Components

The HPTB can
be decomposed into four main functional
components:
1. Network Attachment Units (NAUs):
Each NAU provides connectivity to
the network attached to it
and contains the MAC interface to that network. Therefore, an NAU has
to be developed for each network type to which the HPTB has to be
connected. On the other hand, each NAU
has to interface with the
rest of the HPTB through a common NAU interface. This interface is...